Just bought new black cartridge for 940c printer, usual no is 15, I get home, find I have bought a 45 instead, its the same size, fits in but doesnt work, orange light flashing. Shoould the 45 work OK in this printer?
A friend of mine gave me a HP337 black cartridge to try in mine a while back, mine takes HP338 black cartridges, the 337 wasn't accepted by my printer, even though the 337 was identical in shape/size, the reason they are not accepted if they are put in the wrong model of printer is more than likely down to the circuitry on the cartridge.
I always buy mine online (Play.com) and save quite a bit as well. I worked it out that if I were to buy my HP inks (black and colour) in Argos I would be paying £24 more than I do pay when I get them from (Play.com), that's quite a saving!